Intelligent vehicle-mounted radar device for reducing polarization loss

ABSTRACT

Disclosed is an intelligent vehicle-mounted radar device for reducing polarization loss, wherein, the antenna module includes a dual-polarized antenna, namely, any polarized signal can be measured, and polarization information can be processed and extracted in real time by the polarization digital processor module, the present invention is featured by rapid and real-time. In addition, when the vehicle travels at high speeds, the vehicle-mounted radar device can have certain polarization loss, the present invention can adjust the polarization loss caused by the resonance when the vehicle travels at high speeds, namely, the vehicle speed detection trigger module detects the vehicle speed, when the vehicle speed reaches a first preset value of forming the resonance interference, the polarization control module controls the antenna module to perform polarization calibration, so as to reduce the polarization loss of the intelligent vehicle-mounted radar device, and thus improve the performance of the intelligent vehicle-mounted radar device.

TECHNICAL FIELD OF THE INVENTION

The present invention relates to the technical field of vehicle-mountedradars, and more particularly to an intelligent vehicle-mounted radardevice for reducing polarization loss.

BACKGROUND

With the development of Internet of Vehicles (IoV) technology, theapplication space of vehicle-mounted radar technology becomes larger andlarger, for example, vehicles on highways are numerous and variousaccidents occur frequently. A vehicle-mounted radar device can measureand display the distance from an exterior obstacle to the vehicle. Thedetection is rapid, convenient, easy to calculate and easy to control inreal time. However, the problem in the industry is how to improve theperformance of the intelligent vehicle-mounted radar device.

SUMMARY

In view of the above problems, embodiments of the present inventionprovide an intelligent vehicle-mounted radar device that partially orentirely solves the above problems, which can effectively reduce thepolarization loss of the intelligent vehicle-mounted radar device andthus improve the performance of the intelligent vehicle-mounted radardevice.

In order to solve the above technical problem, the present applicationadopts the following technical solutions:

According to an embodiment of the present invention, there is providedan intelligent vehicle-mounted radar device for reducing polarizationloss, including a transmitting unit for transmitting radar waves and areceiving unit for receiving radar waves transmitted from an externalobject, wherein

the receiving unit includes an antenna module, two microwave front-endmodules, a local oscillation module, two intermediate frequency (IF)amplification modules, two analog-to-digital (A/D) conversion modules, amemory module, a polarization digital processor module, a polarizationcontrol module, a vehicle speed detection trigger module, a rectifiermodule, a crystal triode, a first resistor, a second resistor, a firstcapacitor and a first switch module;

the antenna module and the local oscillation module are both connectedto the two microwave front-end modules, the two microwave front-endmodules are connected to the two IF amplification modules, respectively,the two IF amplification modules are connected to the twoanalog-to-digital conversion modules, respectively, the twoanalog-to-digital conversion modules are both connected to the memorymodule, the memory module is connected to the polarization digitalprocessor module, the polarization control module is connected to theantenna module, the vehicle speed detection trigger module is connectedto the first resistor, the first capacitor and a base of the crystaltriode, a collector of the crystal triode is connected to the secondresistor and the first switch module, the first switch module isconnected to the polarization control module via the rectifier module; aradar wave signal is received by the antenna module, the received radarwave signal is selected by a corresponding microwave front-end module,amplified to an intermediate frequency (IF) signal via the IFamplification module, converted to a digital signal via a correspondinganalog-to-digital conversion module, and cached via the memory module,and polarization information is extracted by the polarization digitalprocessor module from information cached by the memory module, whendetecting a vehicle speed is greater than a first preset value, thevehicle speed detection trigger module triggers the first capacitor todischarge, causing the base of the crystal triode to cut off and thecollector potential to increase, and thereby controls ON of the firstswitch module, the polarization control module controls the antennamodule to perform polarization calibration.

According to an embodiment of the present invention, there is providedan intelligent vehicle-mounted radar device for reducing polarizationloss, wherein, the antenna module can include a dual-polarized antenna,that is, any polarized signal can be measured, and polarizationinformation can be processed and extracted in real time by thepolarization digital processor module, the present invention is featuredby rapid and real-time. In addition, when the vehicle travels at highspeeds, the vehicle-mounted radar device can have certain polarizationloss, the present invention can adjust the polarization loss caused bythe resonance when the vehicle travels at high speeds, namely, thevehicle speed detection trigger module detects the vehicle speed, whenthe vehicle speed reaches a first preset value of forming the resonanceinterference, the polarization control module controls the antennamodule to perform polarization calibration, so as to reduce thepolarization loss of the intelligent vehicle-mounted radar device, andthus improve the performance of the intelligent vehicle-mounted radardevice.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a composition schematic diagram of an intelligentvehicle-mounted radar device according to the present invention;

FIG. 2 is a composition block diagram of a receiving unit in anintelligent vehicle-mounted radar device according to the presentinvention;

FIG. 3 is a schematic diagram of controlling a polarization controlmodule to perform polarization calibration in an intelligentvehicle-mounted radar device according to the present invention; and

FIG. 4 is a schematic diagram of preventing signal interference in localoscillation module in an intelligent vehicle-mounted radar deviceaccording to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIG. 1, which is a composition schematic diagram of anintelligent vehicle-mounted radar device according to the presentinvention, the device includes a transmitting unit 1 for transmittingradar waves and a receiving unit 2 for receiving radar waves transmittedfrom an external object, referring to FIG. 2, in order to extractpolarization information, as a specific embodiment, the receiving unit 2includes an antenna module 201, two microwave front-end modules 202, alocal oscillation module 203, two intermediate frequency (IF)amplification modules 204, two analog-to-digital conversion modules 205,a memory module 206, a polarization digital processor module 207, apolarization control module 208, besides, referring to FIG. 3, in orderto control polarization interference, the vehicle-mounted radar deviceaccording to the present invention further includes a vehicle speeddetection trigger module 209, a rectifier module 210, a first switchmodule 211, a crystal triode VT, a first resistor R1, a second resistorR2 and a first capacitor C1;

During specific implementation, the antenna module 201 and the localoscillation module 203 are both connected to the two microwave front-endmodules 202, the two microwave front-end modules 202 are connected tothe two IF amplification modules 204, respectively, the two IFamplification modules 204 are connected to the two analog-to-digitalconversion modules, respectively, the two analog-to-digital conversionmodules 205 are both connected to the memory module 206, the memorymodule 206 is connected to the polarization digital processor module207, the polarization control module 208 is connected to the antennamodule 201, the vehicle speed detection trigger module 209 is connectedto the first resistor R1, the first capacitor C1 and a base of thecrystal triode VT, a collector of the crystal triode VT is connected tothe second resistor R2 and the first switch module 211, the first switchmodule 211 is connected to the polarization control module 208 via therectifier module 210;

during specific implementation, the antenna module 201 is configured toreceive a radar wave signal transmitted from an external object, themicrowave front-end module 202 is configured to select and mix a signalreceived by the antenna module 201 with a local oscillation signaltransmitted by the local oscillation module 203 to an intermediatefrequency (IF) signal, the IF amplification module 204 amplifies the IFsignal transmitted by the microwave front-end module 202, theanalog-to-digital conversion module 205 A/D-converts the amplified IFsignal to a digital signal, the A/D-converted digital signal informationis cached by the memory module 206, and the polarization digitalprocessor module 207 extracts polarization information from theinformation cached by the memory module 206, particularly, the antennamodule 201 can adopt a dual-polarized antenna, for receiving left-handand right-hand circularly polarized signals, and a detailed descriptionis omitted here.

It should be noted that, when a vehicle speed is greater than a certainvalue, the antenna of the vehicle-mounted radar device can be easilysubjected to resonance, that is, resonance interference is formed on theantenna of the vehicle-mounted radar device, so that polarization lossis reduced, and deviation of the extracted polarization informationoccurs. In order to solve the problem, according to the presentinvention, when detecting the vehicle speed is greater than a firstpreset value, the vehicle speed detection trigger module 209 triggersthe first capacitor C1 to discharge, causing the base of the crystaltriode VT to cut off and the collector potential to increase, andthereby controls ON of the first switch module 211, the polarizationcontrol module 208 controls the antenna module 201 to performpolarization calibration. During specific implementation, the firstpreset value can be a vehicle speed value for generating resonanceinterference according to different types of antenna tests, and thespecific value is not limited herein. In addition, the first switchmodule 211 in the present invention can adopt devices, such as athyristor, which can be turned on by triggering a gate electrode througha trigger signal, in addition, as a specific embodiment, the vehiclespeed detection trigger module 209 can include a vehicle speed detectionsub-module and a switch control sub-module, wherein, the vehicle speeddetection sub-module is configured to detect the speed of the vehiclewhere the vehicle-mounted radar device is located, and the switchcontrol sub-module is configured to control charging and discharging ofthe first capacitor according to the vehicle speed detected by thevehicle speed detection sub-module.

It should be noted that, when a vehicle speed is less than a certainvalue, resonance interference has a less influence, that is,polarization loss substantially has no influence, and polarizationcalibration needs to be turned off, according to the present invention,when the vehicle speed is less than a second preset value, namely, thevehicle speed detection trigger module 209 detects the vehicle speed isless than a second preset value, charging of the first capacitor iscontrolled to turn off the polarization calibration, however, duringspecific implementation, although the vehicle speed has been reduced,resonance interference may last for a period of time, and thepolarization control module may remain in operation for a period oftime, to this end, control can be achieved in the present invention bythe charging time of the first resistor R1 and the first capacitor C1,that is, when the output end voltage of the rectifier module charges thefirst capacitor C1 through the first resistor R1, and the voltage at thetwo ends of the first capacitor C1 rises to be sufficient to enable thecrystal triode VT to be turned on again, the gate electrode of thethyristor serving as the first switch module is equivalent to the groundagain, there is no trigger voltage, and then the thyristor, as the firstswitch module, is turned off, the polarization control module no longerworks, and then the charging time is the working time of thepolarization control module, to guarantee that at least one completepolarization calibration can be achieved in the present invention, thefirst resistor R1 and the first capacitor C1 are charged such that thecharging time is at least one interval period of performing polarizationcalibration by the polarization control module, so that the polarizationcontrol module further can work for at least one complete calibrationperiod, and a detailed description is omitted here.

Further, referring to FIG. 4, when a local oscillation module 203starts, the current sudden change in the circuit can form larger signalinterference to the local oscillation module 203, in order to solve theproblem, the device according to the present invention further include athird resistor R3, a fourth resistor R4, a second capacitor C2, a firstrectifier diode VD1, a second rectifier diode VD2 and a second switchmodule 212, taking the second switch module as a thyristor for example,when the circuit where the local oscillation module is located is turnedon, due to the characteristics of the capacitor, the voltage at the twoends of the second capacitor C2 cannot be suddenly changed, that is, thevoltage at the two ends of the second capacitor C2 is zero, thethyristor, as the second switch module 212 is cut off since there is notrigger voltage, and therefore, the current flowing through the localoscillation module is a half-wave current after being rectified by thesecond rectifier diode VD2, at this time, the second capacitor C2 ischarged via the first rectifier diode VD1 and the third resistor R3,after a certain time delay, and the voltage of the two ends of thesecond capacitor C2 rises to be the turn-on level of the thyristorserving as the second switch module 212, the thyristor, as the secondswitch module 212 is turned on, that is, the current is graduallyincreased, the influence of current sudden change is small, and signalinterference to the local oscillator module is reduced.

What is claimed is:
 1. An intelligent vehicle-mounted radar device forreducing polarization loss, comprising a transmitting unit fortransmitting radar waves and a receiving unit for receiving radar wavestransmitted from an external object; wherein the receiving unitcomprises an antenna module, two microwave front-end modules, a localoscillation module, two intermediate frequency (IF) amplificationmodules, two analog-to-digital conversion modules, a memory module, apolarization digital processor module, a polarization control module, avehicle speed detection trigger module, a rectifier module, a crystaltriode, a first resistor, a second resistor, a first capacitor and afirst switch module; the antenna module and the local oscillation moduleare both connected to the two microwave front-end modules, the twomicrowave front-end modules are connected to the two IF amplificationmodules, respectively, the two IF amplification modules are connected tothe two analog-to-digital conversion modules, respectively, the twoanalog-to-digital conversion modules are both connected to the memorymodule, the memory module is connected to the polarization digitalprocessor module, the polarization control module is connected to theantenna module, the vehicle speed detection trigger module is connectedto the first resistor, the first capacitor and a base of the crystaltriode, a collector of the crystal triode is connected to the secondresistor and the first switch module, the first switch module isconnected to the polarization control module via the rectifier module; aradar wave signal is received by the antenna module, the received radarwave signal is selected by a corresponding microwave front-end module,amplified to an intermediate frequency (IF) signal via the IFamplification module, converted to a digital signal via a correspondinganalog-to-digital conversion module, and cached via the memory module,and polarization information is extracted by the polarization digitalprocessor module from information cached by the memory module, whendetecting a vehicle speed is greater than a first preset value, thevehicle speed detection trigger module triggers the first capacitor todischarge, causing the base of the crystal triode to cut off and thecollector potential to increase, and thereby controls ON of the firstswitch module, the polarization control module controls the antennamodule to perform polarization calibration.
 2. The intelligentvehicle-mounted radar device for reducing polarization loss according toclaim 1, wherein, the vehicle speed detection trigger module comprises avehicle speed detection sub-module and a switch control sub-module,wherein, the vehicle speed detection sub-module is configured to detectthe speed of the vehicle where the vehicle-mounted radar device islocated, and the switch control sub-module is configured to controlcharging and discharging of the first capacitor according to the vehiclespeed detected by the vehicle speed detection sub-module.
 3. Theintelligent vehicle-mounted radar device for reducing polarization lossaccording to claim 2, wherein, the first resistor and the firstcapacitor are charged such that the charging time is at least oneinterval period of performing polarization calibration by thepolarization control module.
 4. The intelligent vehicle-mounted radardevice for reducing polarization loss according to claim 1, wherein, theantenna module comprises a dual-polarized antenna.
 5. The intelligentvehicle-mounted radar device for reducing polarization loss according toclaim 1, wherein, the first switch module is a thyristor.